Making Health Calculations Simple
Everyone needs access to reliable health metrics. Our 264 professional calculators transform complex medical formulas into simple, actionable insights - all completely free.
100% Private
All calculations happen in your browser. We never store or transmit your health data.
Medical Accuracy
Every calculator uses established medical formulas from trusted health organizations.
User Focused
Simple, intuitive tools designed for everyone, regardless of medical knowledge.
Meet Our Founders
Two Croatian developers revolutionizing access to health calculation tools
Entrepreneurial Vision & User-Focused Design
Jurica Šinko is a remarkable Croatian entrepreneur who became the youngest registered company director in Croatia at just 18 years old. His proven ability to identify user needs and create accessible digital solutions drives our mission to make health information and calculations available to everyone, regardless of their medical knowledge or technical expertise.
Building User-Centric Platforms
While still a high school student at Varaždin's Electromechanical School, Jurica identified market gaps and founded Kupi Key d.o.o. in March 2012. By 2014, the company had cleared over HRK 1 million in net profit, serving over 300,000 customers worldwide with a focus on accessibility and user experience.
Democratizing Health Information
His vision for Health Calculator Online is to break down barriers to health information. We believe everyone deserves access to reliable health calculation tools based on established medical research and guidelines, presented in an accessible, user-friendly format.
"Making complex health calculations accessible to everyone, regardless of their medical background. We research extensively, validate thoroughly, and present clearly - ensuring that anyone can understand their health metrics and make informed decisions."
Technical Excellence & Health Data Expertise
Marko Šinko is a Croatian developer with exceptional programming abilities and a passion for creating accessible health information tools. His expertise in data processing, API integration, and algorithm development ensures that every health calculator on our platform delivers accurate, research-based results sourced from trusted medical and scientific resources.
Academic Foundation & Data Research
B.Sc. Computer Science from Faculty of Organization & Informatics (FOI), University of Zagreb. His 2013 thesis "DBpedia u primjeni" demonstrated early interest in semantic web data - skills he now applies to organizing and presenting complex health data in an accessible format.
Health Information Research
Specializes in translating complex medical formulas and research papers into user-friendly tools, working closely with health data APIs and medical databases. Ensures extensive cross-referencing of medical literature and validation against established clinical standards.
"Every tool we create is backed by scientific research and presented with transparency. Our commitment to accuracy means regular updates to reflect new health guidelines - making our platform a reliable resource for health-conscious individuals worldwide."
Our Story
What started as a simple idea has grown into a comprehensive health calculation platform
The Beginning
We noticed something frustrating: finding accurate health calculations meant jumping between dozens of sites, each with different formulas and questionable accuracy. Medical professionals had their tools, but regular people were left guessing. We knew we could do better.
The Research
We spent months diving into medical journals, WHO guidelines, and clinical research papers. Every formula was verified against multiple sources. Every calculation was tested against real-world scenarios. We weren't doctors, but we became experts at understanding and implementing medical calculations correctly.
Today
Now with 264 calculators covering 760+ health-related searches, we're the go-to resource for anyone needing quick, accurate health calculations. From BMI to medication dosing, from pregnancy tracking to fitness planning - we've built the tools people actually need, presented in a way anyone can understand.
Important Medical Disclaimer
We are developers and health information researchers, not medical professionals. Our calculators are educational tools based on published medical research and established formulas.
Always consult qualified healthcare providers for medical advice, diagnosis, or treatment. Never use our calculators as a substitute for professional medical consultation.
Explore More Health Calculators
Discover our complete collection of 264 health calculators